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/*
* Copyright 2006 The Android Open Source Project
*
* Some handy functions for manipulating bits and bytes.
*/
#ifndef _MINZIP_BITS
#define _MINZIP_BITS
#include "inline_magic.h"
#include <stdlib.h>
#include <string.h>
/*
* Get 1 byte. (Included to make the code more legible.)
*/
INLINE unsigned char get1(unsigned const char* pSrc)
{
return *pSrc;
}
/*
* Get 2 big-endian bytes.
*/
INLINE unsigned short get2BE(unsigned char const* pSrc)
{
unsigned short result;
result = *pSrc++ << 8;
result |= *pSrc++;
return result;
}
/*
* Get 4 big-endian bytes.
*/
INLINE unsigned int get4BE(unsigned char const* pSrc)
{
unsigned int result;
result = *pSrc++ << 24;
result |= *pSrc++ << 16;
result |= *pSrc++ << 8;
result |= *pSrc++;
return result;
}
/*
* Get 8 big-endian bytes.
*/
INLINE unsigned long long get8BE(unsigned char const* pSrc)
{
unsigned long long result;
result = (unsigned long long) *pSrc++ << 56;
result |= (unsigned long long) *pSrc++ << 48;
result |= (unsigned long long) *pSrc++ << 40;
result |= (unsigned long long) *pSrc++ << 32;
result |= (unsigned long long) *pSrc++ << 24;
result |= (unsigned long long) *pSrc++ << 16;
result |= (unsigned long long) *pSrc++ << 8;
result |= (unsigned long long) *pSrc++;
return result;
}
/*
* Get 2 little-endian bytes.
*/
INLINE unsigned short get2LE(unsigned char const* pSrc)
{
unsigned short result;
result = *pSrc++;
result |= *pSrc++ << 8;
return result;
}
/*
* Get 4 little-endian bytes.
*/
INLINE unsigned int get4LE(unsigned char const* pSrc)
{
unsigned int result;
result = *pSrc++;
result |= *pSrc++ << 8;
result |= *pSrc++ << 16;
result |= *pSrc++ << 24;
return result;
}
/*
* Get 8 little-endian bytes.
*/
INLINE unsigned long long get8LE(unsigned char const* pSrc)
{
unsigned long long result;
result = (unsigned long long) *pSrc++;
result |= (unsigned long long) *pSrc++ << 8;
result |= (unsigned long long) *pSrc++ << 16;
result |= (unsigned long long) *pSrc++ << 24;
result |= (unsigned long long) *pSrc++ << 32;
result |= (unsigned long long) *pSrc++ << 40;
result |= (unsigned long long) *pSrc++ << 48;
result |= (unsigned long long) *pSrc++ << 56;
return result;
}
/*
* Grab 1 byte and advance the data pointer.
*/
INLINE unsigned char read1(unsigned const char** ppSrc)
{
return *(*ppSrc)++;
}
/*
* Grab 2 big-endian bytes and advance the data pointer.
*/
INLINE unsigned short read2BE(unsigned char const** ppSrc)
{
unsigned short result;
result = *(*ppSrc)++ << 8;
result |= *(*ppSrc)++;
return result;
}
/*
* Grab 4 big-endian bytes and advance the data pointer.
*/
INLINE unsigned int read4BE(unsigned char const** ppSrc)
{
unsigned int result;
result = *(*ppSrc)++ << 24;
result |= *(*ppSrc)++ << 16;
result |= *(*ppSrc)++ << 8;
result |= *(*ppSrc)++;
return result;
}
/*
* Get 8 big-endian bytes.
*/
INLINE unsigned long long read8BE(unsigned char const** ppSrc)
{
unsigned long long result;
result = (unsigned long long) *(*ppSrc)++ << 56;
result |= (unsigned long long) *(*ppSrc)++ << 48;
result |= (unsigned long long) *(*ppSrc)++ << 40;
result |= (unsigned long long) *(*ppSrc)++ << 32;
result |= (unsigned long long) *(*ppSrc)++ << 24;
result |= (unsigned long long) *(*ppSrc)++ << 16;
result |= (unsigned long long) *(*ppSrc)++ << 8;
result |= (unsigned long long) *(*ppSrc)++;
return result;
}
/*
* Grab 2 little-endian bytes and advance the data pointer.
*/
INLINE unsigned short read2LE(unsigned char const** ppSrc)
{
unsigned short result;
result = *(*ppSrc)++;
result |= *(*ppSrc)++ << 8;
return result;
}
/*
* Grab 4 little-endian bytes and advance the data pointer.
*/
INLINE unsigned int read4LE(unsigned char const** ppSrc)
{
unsigned int result;
result = *(*ppSrc)++;
result |= *(*ppSrc)++ << 8;
result |= *(*ppSrc)++ << 16;
result |= *(*ppSrc)++ << 24;
return result;
}
/*
* Get 8 little-endian bytes.
*/
INLINE unsigned long long read8LE(unsigned char const** ppSrc)
{
unsigned long long result;
result = (unsigned long long) *(*ppSrc)++;
result |= (unsigned long long) *(*ppSrc)++ << 8;
result |= (unsigned long long) *(*ppSrc)++ << 16;
result |= (unsigned long long) *(*ppSrc)++ << 24;
result |= (unsigned long long) *(*ppSrc)++ << 32;
result |= (unsigned long long) *(*ppSrc)++ << 40;
result |= (unsigned long long) *(*ppSrc)++ << 48;
result |= (unsigned long long) *(*ppSrc)++ << 56;
return result;
}
/*
* Skip over a UTF-8 string.
*/
INLINE void skipUtf8String(unsigned char const** ppSrc)
{
unsigned int length = read4BE(ppSrc);
(*ppSrc) += length;
}
/*
* Read a UTF-8 string into a fixed-size buffer, and null-terminate it.
*
* Returns the length of the original string.
*/
INLINE int readUtf8String(unsigned char const** ppSrc, char* buf, size_t bufLen)
{
unsigned int length = read4BE(ppSrc);
size_t copyLen = (length < bufLen) ? length : bufLen-1;
memcpy(buf, *ppSrc, copyLen);
buf[copyLen] = '\0';
(*ppSrc) += length;
return length;
}
/*
* Read a UTF-8 string into newly-allocated storage, and null-terminate it.
*
* Returns the string and its length. (The latter is probably unnecessary
* for the way we're using UTF8.)
*/
INLINE char* readNewUtf8String(unsigned char const** ppSrc, size_t* pLength)
{
unsigned int length = read4BE(ppSrc);
char* buf;
buf = (char*) malloc(length+1);
memcpy(buf, *ppSrc, length);
buf[length] = '\0';
(*ppSrc) += length;
*pLength = length;
return buf;
}
/*
* Set 1 byte. (Included to make the code more legible.)
*/
INLINE void set1(unsigned char* buf, unsigned char val)
{
*buf = (unsigned char)(val);
}
/*
* Set 2 big-endian bytes.
*/
INLINE void set2BE(unsigned char* buf, unsigned short val)
{
*buf++ = (unsigned char)(val >> 8);
*buf = (unsigned char)(val);
}
/*
* Set 4 big-endian bytes.
*/
INLINE void set4BE(unsigned char* buf, unsigned int val)
{
*buf++ = (unsigned char)(val >> 24);
*buf++ = (unsigned char)(val >> 16);
*buf++ = (unsigned char)(val >> 8);
*buf = (unsigned char)(val);
}
/*
* Set 8 big-endian bytes.
*/
INLINE void set8BE(unsigned char* buf, unsigned long long val)
{
*buf++ = (unsigned char)(val >> 56);
*buf++ = (unsigned char)(val >> 48);
*buf++ = (unsigned char)(val >> 40);
*buf++ = (unsigned char)(val >> 32);
*buf++ = (unsigned char)(val >> 24);
*buf++ = (unsigned char)(val >> 16);
*buf++ = (unsigned char)(val >> 8);
*buf = (unsigned char)(val);
}
/*
* Set 2 little-endian bytes.
*/
INLINE void set2LE(unsigned char* buf, unsigned short val)
{
*buf++ = (unsigned char)(val);
*buf = (unsigned char)(val >> 8);
}
/*
* Set 4 little-endian bytes.
*/
INLINE void set4LE(unsigned char* buf, unsigned int val)
{
*buf++ = (unsigned char)(val);
*buf++ = (unsigned char)(val >> 8);
*buf++ = (unsigned char)(val >> 16);
*buf = (unsigned char)(val >> 24);
}
/*
* Set 8 little-endian bytes.
*/
INLINE void set8LE(unsigned char* buf, unsigned long long val)
{
*buf++ = (unsigned char)(val);
*buf++ = (unsigned char)(val >> 8);
*buf++ = (unsigned char)(val >> 16);
*buf++ = (unsigned char)(val >> 24);
*buf++ = (unsigned char)(val >> 32);
*buf++ = (unsigned char)(val >> 40);
*buf++ = (unsigned char)(val >> 48);
*buf = (unsigned char)(val >> 56);
}
/*
* Stuff a UTF-8 string into the buffer.
*/
INLINE void setUtf8String(unsigned char* buf, const unsigned char* str)
{
unsigned int strLen = strlen((const char*)str);
set4BE(buf, strLen);
memcpy(buf + sizeof(unsigned int), str, strLen);
}
#endif /*_MINZIP_BITS*/
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